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1 : edgomez 851 /******************************************************************************
2 :     * *
3 :     * This file is part of XviD, a free MPEG-4 video encoder/decoder *
4 :     * *
5 :     * XviD is an implementation of a part of one or more MPEG-4 Video tools *
6 :     * as specified in ISO/IEC 14496-2 standard. Those intending to use this *
7 :     * software module in hardware or software products are advised that its *
8 :     * use may infringe existing patents or copyrights, and any such use *
9 :     * would be at such party's own risk. The original developer of this *
10 :     * software module and his/her company, and subsequent editors and their *
11 :     * companies, will have no liability for use of this software or *
12 :     * modifications or derivatives thereof. *
13 :     * *
14 :     * XviD is free software; you can redistribute it and/or modify it *
15 :     * under the terms of the GNU General Public License as published by *
16 :     * the Free Software Foundation; either version 2 of the License, or *
17 :     * (at your option) any later version. *
18 :     * *
19 :     * XviD is distributed in the hope that it will be useful, but *
20 :     * WITHOUT ANY WARRANTY; without even the implied warranty of *
21 :     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
22 :     * GNU General Public License for more details. *
23 :     * *
24 :     * You should have received a copy of the GNU General Public License *
25 :     * along with this program; if not, write to the Free Software *
26 :     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
27 :     * *
28 :     ******************************************************************************/
29 : Isibaar 3
30 : edgomez 851 /******************************************************************************
31 :     * *
32 :     * bitstream.c *
33 :     * *
34 :     * Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> *
35 :     * *
36 :     * For more information visit the XviD homepage: http://www.xvid.org *
37 :     * *
38 :     ******************************************************************************/
39 :    
40 :     /******************************************************************************
41 :     * *
42 :     * Revision history: *
43 :     * *
44 :     * 05.01.2003 GMC support - gruel *
45 :     * 04.10.2002 qpel support - Isibaar *
46 :     * 11.07.2002 add VOP width & height return to dec when dec->width *
47 :     * or dec->height is 0 (for use in examples/ex1.c) *
48 :     * MinChen <chenm001@163.com> *
49 :     * 22.05.2002 bs_put_matrix fix *
50 :     * 20.05.2002 added BitstreamWriteUserData *
51 :     * 19.06.2002 Fix a little bug in use custom quant matrix *
52 :     * MinChen <chenm001@163.com> *
53 :     * 08.05.2002 add low_delay support for B_VOP decode *
54 :     * MinChen <chenm001@163.com> *
55 :     * 06.05.2002 low_delay *
56 :     * 06.05.2002 fixed fincr/fbase error *
57 :     * 01.05.2002 added BVOP support to BitstreamWriteVopHeader *
58 :     * 15.04.2002 rewrite log2bin use asm386 By MinChen <chenm001@163.com> *
59 :     * 26.03.2002 interlacing support *
60 :     * 03.03.2002 qmatrix writing *
61 :     * 03.03.2002 merged BITREADER and BITWRITER *
62 :     * 30.02.2002 intra_dc_threshold support *
63 :     * 04.12.2001 support for additional headers *
64 :     * 16.12.2001 inital version *
65 :     * *
66 :     ******************************************************************************/
67 :    
68 :    
69 :     #include <string.h>
70 :     #include <stdio.h>
71 :    
72 : Isibaar 3 #include "bitstream.h"
73 :     #include "zigzag.h"
74 : Isibaar 4 #include "../quant/quant_matrix.h"
75 : edgomez 851 #include "mbcoding.h"
76 : Isibaar 3
77 : chenm001 124
78 : edgomez 195 static uint32_t __inline
79 :     log2bin(uint32_t value)
80 : Isibaar 3 {
81 : chenm001 124 /* Changed by Chenm001 */
82 : suxen_drol 529 #if !defined(_MSC_VER)
83 : Isibaar 3 int n = 0;
84 : edgomez 195
85 :     while (value) {
86 : Isibaar 3 value >>= 1;
87 :     n++;
88 :     }
89 :     return n;
90 : chenm001 124 #else
91 : edgomez 195 __asm {
92 : suxen_drol 206 bsr eax, value
93 :     inc eax
94 :     }
95 : chenm001 124 #endif
96 : Isibaar 3 }
97 :    
98 :    
99 : edgomez 195 static const uint32_t intra_dc_threshold_table[] = {
100 :     32, /* never use */
101 : Isibaar 3 13,
102 :     15,
103 :     17,
104 :     19,
105 :     21,
106 :     23,
107 :     1,
108 :     };
109 :    
110 :    
111 : edgomez 195 void
112 :     bs_get_matrix(Bitstream * bs,
113 :     uint8_t * matrix)
114 :     {
115 :     int i = 0;
116 :     int last, value = 0;
117 : Isibaar 4
118 : edgomez 195 do {
119 :     last = value;
120 :     value = BitstreamGetBits(bs, 8);
121 :     matrix[scan_tables[0][i++]] = value;
122 :     }
123 :     while (value != 0 && i < 64);
124 : edgomez 851 i--; // fix little bug at coeff not full
125 : edgomez 195
126 :     while (i < 64) {
127 :     matrix[scan_tables[0][i++]] = last;
128 :     }
129 :     }
130 :    
131 : suxen_drol 248
132 :    
133 : edgomez 851 // for PVOP addbits == fcode - 1
134 :     // for BVOP addbits == max(fcode,bcode) - 1
135 :     // returns mbpos
136 : suxen_drol 248 int
137 : edgomez 851 read_video_packet_header(Bitstream *bs,
138 :     DECODER * dec,
139 :     const int addbits,
140 :     int * quant,
141 :     int * fcode_forward,
142 :     int * fcode_backward,
143 :     int * intra_dc_threshold)
144 : suxen_drol 248 {
145 : edgomez 851 int startcode_bits = NUMBITS_VP_RESYNC_MARKER + addbits;
146 :     int mbnum_bits = log2bin(dec->mb_width * dec->mb_height - 1);
147 : suxen_drol 248 int mbnum;
148 : edgomez 851 int hec = 0;
149 : suxen_drol 248
150 :     BitstreamSkip(bs, BitstreamNumBitsToByteAlign(bs));
151 : edgomez 851 BitstreamSkip(bs, startcode_bits);
152 : suxen_drol 248
153 : suxen_drol 252 DPRINTF(DPRINTF_STARTCODE, "<video_packet_header>");
154 :    
155 : edgomez 851 if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
156 :     {
157 :     hec = BitstreamGetBit(bs); /* header_extension_code */
158 :     if (hec && !(dec->sprite_enable == SPRITE_STATIC /* && current_coding_type = I_VOP */))
159 :     {
160 :     BitstreamSkip(bs, 13); /* vop_width */
161 :     READ_MARKER();
162 :     BitstreamSkip(bs, 13); /* vop_height */
163 :     READ_MARKER();
164 :     BitstreamSkip(bs, 13); /* vop_horizontal_mc_spatial_ref */
165 :     READ_MARKER();
166 :     BitstreamSkip(bs, 13); /* vop_vertical_mc_spatial_ref */
167 :     READ_MARKER();
168 :     }
169 :     }
170 : suxen_drol 248
171 : edgomez 851 mbnum = BitstreamGetBits(bs, mbnum_bits); /* macroblock_number */
172 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "mbnum %i", mbnum);
173 : suxen_drol 248
174 : edgomez 851 if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY)
175 :     {
176 :     *quant = BitstreamGetBits(bs, dec->quant_bits); /* quant_scale */
177 :     DPRINTF(DPRINTF_HEADER, "quant %i", *quant);
178 :     }
179 : suxen_drol 248
180 : edgomez 851 if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR)
181 :     hec = BitstreamGetBit(bs); /* header_extension_code */
182 :    
183 :    
184 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "header_extension_code %i", hec);
185 : edgomez 851 if (hec)
186 :     {
187 :     int time_base;
188 :     int time_increment;
189 :     int coding_type;
190 : suxen_drol 248
191 : edgomez 851 for (time_base=0; BitstreamGetBit(bs)!=0; time_base++); /* modulo_time_base */
192 :     READ_MARKER();
193 :     if (dec->time_inc_bits)
194 :     time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); /* vop_time_increment */
195 :     READ_MARKER();
196 :     DPRINTF(DPRINTF_HEADER,"time %i:%i", time_base, time_increment);
197 :    
198 :     coding_type = BitstreamGetBits(bs, 2);
199 :     DPRINTF(DPRINTF_HEADER,"coding_type %i", coding_type);
200 :    
201 :     if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
202 :     {
203 :     BitstreamSkip(bs, 1); /* change_conv_ratio_disable */
204 :     if (coding_type != I_VOP)
205 :     BitstreamSkip(bs, 1); /* vop_shape_coding_type */
206 :     }
207 :    
208 :     if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY)
209 :     {
210 :     *intra_dc_threshold = intra_dc_threshold_table[BitstreamGetBits(bs, 3)];
211 :    
212 :     if (dec->sprite_enable == SPRITE_GMC && coding_type == S_VOP &&
213 :     dec->sprite_warping_points > 0)
214 :     {
215 :     // TODO: sprite trajectory
216 :     }
217 :     if (dec->reduced_resolution_enable &&
218 :     dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR &&
219 :     (coding_type == P_VOP || coding_type == I_VOP))
220 :     {
221 :     BitstreamSkip(bs, 1); /* XXX: vop_reduced_resolution */
222 :     }
223 :    
224 :     if (coding_type != I_VOP && fcode_forward)
225 :     {
226 :     *fcode_forward = BitstreamGetBits(bs, 3);
227 :     DPRINTF(DPRINTF_HEADER,"fcode_forward %i", *fcode_forward);
228 :     }
229 :    
230 :     if (coding_type == B_VOP && fcode_backward)
231 :     {
232 :     *fcode_backward = BitstreamGetBits(bs, 3);
233 :     DPRINTF(DPRINTF_HEADER,"fcode_backward %i", *fcode_backward);
234 :     }
235 :     }
236 :    
237 :     }
238 :    
239 :     if (dec->newpred_enable)
240 :     {
241 :     int vop_id;
242 :     int vop_id_for_prediction;
243 :    
244 :     vop_id = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
245 :     DPRINTF(DPRINTF_HEADER, "vop_id %i", vop_id);
246 :     if (BitstreamGetBit(bs)) /* vop_id_for_prediction_indication */
247 :     {
248 :     vop_id_for_prediction = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
249 :     DPRINTF(DPRINTF_HEADER, "vop_id_for_prediction %i", vop_id_for_prediction);
250 :     }
251 :     READ_MARKER();
252 :     }
253 :    
254 : suxen_drol 248 return mbnum;
255 :     }
256 :    
257 :    
258 :    
259 : edgomez 851
260 :     /* vol estimation header */
261 :     static void
262 :     read_vol_complexity_estimation_header(Bitstream * bs, DECODER * dec)
263 :     {
264 :     ESTIMATION * e = &dec->estimation;
265 :    
266 :     e->method = BitstreamGetBits(bs, 2); /* estimation_method */
267 :     DPRINTF(DPRINTF_HEADER,"+ complexity_estimation_header; method=%i", e->method);
268 :    
269 :     if (e->method == 0 || e->method == 1)
270 :     {
271 :     if (!BitstreamGetBit(bs)) /* shape_complexity_estimation_disable */
272 :     {
273 :     e->opaque = BitstreamGetBit(bs); /* opaque */
274 :     e->transparent = BitstreamGetBit(bs); /* transparent */
275 :     e->intra_cae = BitstreamGetBit(bs); /* intra_cae */
276 :     e->inter_cae = BitstreamGetBit(bs); /* inter_cae */
277 :     e->no_update = BitstreamGetBit(bs); /* no_update */
278 :     e->upsampling = BitstreamGetBit(bs); /* upsampling */
279 :     }
280 :    
281 :     if (!BitstreamGetBit(bs)) /* texture_complexity_estimation_set_1_disable */
282 :     {
283 :     e->intra_blocks = BitstreamGetBit(bs); /* intra_blocks */
284 :     e->inter_blocks = BitstreamGetBit(bs); /* inter_blocks */
285 :     e->inter4v_blocks = BitstreamGetBit(bs); /* inter4v_blocks */
286 :     e->not_coded_blocks = BitstreamGetBit(bs); /* not_coded_blocks */
287 :     }
288 :     }
289 :    
290 :     READ_MARKER();
291 :    
292 :     if (!BitstreamGetBit(bs)) /* texture_complexity_estimation_set_2_disable */
293 :     {
294 :     e->dct_coefs = BitstreamGetBit(bs); /* dct_coefs */
295 :     e->dct_lines = BitstreamGetBit(bs); /* dct_lines */
296 :     e->vlc_symbols = BitstreamGetBit(bs); /* vlc_symbols */
297 :     e->vlc_bits = BitstreamGetBit(bs); /* vlc_bits */
298 :     }
299 :    
300 :     if (!BitstreamGetBit(bs)) /* motion_compensation_complexity_disable */
301 :     {
302 :     e->apm = BitstreamGetBit(bs); /* apm */
303 :     e->npm = BitstreamGetBit(bs); /* npm */
304 :     e->interpolate_mc_q = BitstreamGetBit(bs); /* interpolate_mc_q */
305 :     e->forw_back_mc_q = BitstreamGetBit(bs); /* forw_back_mc_q */
306 :     e->halfpel2 = BitstreamGetBit(bs); /* halfpel2 */
307 :     e->halfpel4 = BitstreamGetBit(bs); /* halfpel4 */
308 :     }
309 :    
310 :     READ_MARKER();
311 :    
312 :     if (e->method == 1)
313 :     {
314 :     if (!BitstreamGetBit(bs)) /* version2_complexity_estimation_disable */
315 :     {
316 :     e->sadct = BitstreamGetBit(bs); /* sadct */
317 :     e->quarterpel = BitstreamGetBit(bs); /* quarterpel */
318 :     }
319 :     }
320 :     }
321 :    
322 :    
323 :     /* vop estimation header */
324 :     static void
325 :     read_vop_complexity_estimation_header(Bitstream * bs, DECODER * dec, int coding_type)
326 :     {
327 :     ESTIMATION * e = &dec->estimation;
328 :    
329 :     if (e->method == 0 || e->method == 1)
330 :     {
331 :     if (coding_type == I_VOP) {
332 :     if (e->opaque) BitstreamSkip(bs, 8); /* dcecs_opaque */
333 :     if (e->transparent) BitstreamSkip(bs, 8); /* */
334 :     if (e->intra_cae) BitstreamSkip(bs, 8); /* */
335 :     if (e->inter_cae) BitstreamSkip(bs, 8); /* */
336 :     if (e->no_update) BitstreamSkip(bs, 8); /* */
337 :     if (e->upsampling) BitstreamSkip(bs, 8); /* */
338 :     if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
339 :     if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
340 :     if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
341 :     if (e->dct_lines) BitstreamSkip(bs, 8); /* */
342 :     if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
343 :     if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
344 :     if (e->sadct) BitstreamSkip(bs, 8); /* */
345 :     }
346 :    
347 :     if (coding_type == P_VOP) {
348 :     if (e->opaque) BitstreamSkip(bs, 8); /* */
349 :     if (e->transparent) BitstreamSkip(bs, 8); /* */
350 :     if (e->intra_cae) BitstreamSkip(bs, 8); /* */
351 :     if (e->inter_cae) BitstreamSkip(bs, 8); /* */
352 :     if (e->no_update) BitstreamSkip(bs, 8); /* */
353 :     if (e->upsampling) BitstreamSkip(bs, 8); /* */
354 :     if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
355 :     if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
356 :     if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
357 :     if (e->dct_lines) BitstreamSkip(bs, 8); /* */
358 :     if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
359 :     if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
360 :     if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
361 :     if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
362 :     if (e->apm) BitstreamSkip(bs, 8); /* */
363 :     if (e->npm) BitstreamSkip(bs, 8); /* */
364 :     if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
365 :     if (e->halfpel2) BitstreamSkip(bs, 8); /* */
366 :     if (e->halfpel4) BitstreamSkip(bs, 8); /* */
367 :     if (e->sadct) BitstreamSkip(bs, 8); /* */
368 :     if (e->quarterpel) BitstreamSkip(bs, 8); /* */
369 :     }
370 :     if (coding_type == B_VOP) {
371 :     if (e->opaque) BitstreamSkip(bs, 8); /* */
372 :     if (e->transparent) BitstreamSkip(bs, 8); /* */
373 :     if (e->intra_cae) BitstreamSkip(bs, 8); /* */
374 :     if (e->inter_cae) BitstreamSkip(bs, 8); /* */
375 :     if (e->no_update) BitstreamSkip(bs, 8); /* */
376 :     if (e->upsampling) BitstreamSkip(bs, 8); /* */
377 :     if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
378 :     if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
379 :     if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
380 :     if (e->dct_lines) BitstreamSkip(bs, 8); /* */
381 :     if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
382 :     if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
383 :     if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
384 :     if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
385 :     if (e->apm) BitstreamSkip(bs, 8); /* */
386 :     if (e->npm) BitstreamSkip(bs, 8); /* */
387 :     if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
388 :     if (e->halfpel2) BitstreamSkip(bs, 8); /* */
389 :     if (e->halfpel4) BitstreamSkip(bs, 8); /* */
390 :     if (e->interpolate_mc_q) BitstreamSkip(bs, 8); /* */
391 :     if (e->sadct) BitstreamSkip(bs, 8); /* */
392 :     if (e->quarterpel) BitstreamSkip(bs, 8); /* */
393 :     }
394 :    
395 :     if (coding_type == S_VOP && dec->sprite_enable == SPRITE_STATIC) {
396 :     if (e->intra_blocks) BitstreamSkip(bs, 8); /* */
397 :     if (e->not_coded_blocks) BitstreamSkip(bs, 8); /* */
398 :     if (e->dct_coefs) BitstreamSkip(bs, 8); /* */
399 :     if (e->dct_lines) BitstreamSkip(bs, 8); /* */
400 :     if (e->vlc_symbols) BitstreamSkip(bs, 8); /* */
401 :     if (e->vlc_bits) BitstreamSkip(bs, 8); /* */
402 :     if (e->inter_blocks) BitstreamSkip(bs, 8); /* */
403 :     if (e->inter4v_blocks) BitstreamSkip(bs, 8); /* */
404 :     if (e->apm) BitstreamSkip(bs, 8); /* */
405 :     if (e->npm) BitstreamSkip(bs, 8); /* */
406 :     if (e->forw_back_mc_q) BitstreamSkip(bs, 8); /* */
407 :     if (e->halfpel2) BitstreamSkip(bs, 8); /* */
408 :     if (e->halfpel4) BitstreamSkip(bs, 8); /* */
409 :     if (e->interpolate_mc_q) BitstreamSkip(bs, 8); /* */
410 :     }
411 :     }
412 :     }
413 :    
414 :    
415 :    
416 :    
417 :    
418 : Isibaar 3 /*
419 :     decode headers
420 :     returns coding_type, or -1 if error
421 :     */
422 :    
423 : suxen_drol 252 #define VIDOBJ_START_CODE_MASK 0x0000001f
424 :     #define VIDOBJLAY_START_CODE_MASK 0x0000000f
425 :    
426 : edgomez 195 int
427 :     BitstreamReadHeaders(Bitstream * bs,
428 :     DECODER * dec,
429 :     uint32_t * rounding,
430 : edgomez 851 uint32_t * reduced_resolution,
431 : edgomez 195 uint32_t * quant,
432 :     uint32_t * fcode_forward,
433 :     uint32_t * fcode_backward,
434 : edgomez 851 uint32_t * intra_dc_threshold,
435 :     WARPPOINTS *gmc_warp)
436 : Isibaar 3 {
437 :     uint32_t vol_ver_id;
438 :     uint32_t coding_type;
439 :     uint32_t start_code;
440 : edgomez 195 uint32_t time_incr = 0;
441 : edgomez 876 int32_t time_increment = 0;
442 : edgomez 851 int resize = 0;
443 : chenm001 156
444 : edgomez 195 do {
445 : edgomez 851
446 : Isibaar 3 BitstreamByteAlign(bs);
447 :     start_code = BitstreamShowBits(bs, 32);
448 :    
449 : edgomez 195 if (start_code == VISOBJSEQ_START_CODE) {
450 : suxen_drol 252
451 :     int profile;
452 :    
453 :     DPRINTF(DPRINTF_STARTCODE, "<visual_object_sequence>");
454 :    
455 : edgomez 851 BitstreamSkip(bs, 32); // visual_object_sequence_start_code
456 :     profile = BitstreamGetBits(bs, 8); // profile_and_level_indication
457 : suxen_drol 252
458 :     DPRINTF(DPRINTF_HEADER, "profile_and_level_indication %i", profile);
459 :    
460 : edgomez 195 } else if (start_code == VISOBJSEQ_STOP_CODE) {
461 : suxen_drol 252
462 : edgomez 851 BitstreamSkip(bs, 32); // visual_object_sequence_stop_code
463 : suxen_drol 252
464 :     DPRINTF(DPRINTF_STARTCODE, "</visual_object_sequence>");
465 :    
466 : edgomez 195 } else if (start_code == VISOBJ_START_CODE) {
467 : edgomez 851 int visobj_ver_id;
468 : suxen_drol 252
469 :     DPRINTF(DPRINTF_STARTCODE, "<visual_object>");
470 :    
471 : edgomez 851 BitstreamSkip(bs, 32); // visual_object_start_code
472 :     if (BitstreamGetBit(bs)) // is_visual_object_identified
473 : Isibaar 3 {
474 : edgomez 851 visobj_ver_id = BitstreamGetBits(bs, 4); // visual_object_ver_id
475 :     DPRINTF(DPRINTF_HEADER,"visobj_ver_id %i", visobj_ver_id);
476 :     BitstreamSkip(bs, 3); // visual_object_priority
477 : edgomez 195 } else {
478 : edgomez 851 visobj_ver_id = 1;
479 : Isibaar 3 }
480 :    
481 : edgomez 851 if (BitstreamShowBits(bs, 4) != VISOBJ_TYPE_VIDEO) // visual_object_type
482 : Isibaar 3 {
483 : suxen_drol 252 DPRINTF(DPRINTF_ERROR, "visual_object_type != video");
484 : Isibaar 3 return -1;
485 :     }
486 :     BitstreamSkip(bs, 4);
487 :    
488 : edgomez 851 // video_signal_type
489 : Isibaar 3
490 : edgomez 851 if (BitstreamGetBit(bs)) // video_signal_type
491 : Isibaar 3 {
492 : suxen_drol 252 DPRINTF(DPRINTF_HEADER,"+ video_signal_type");
493 : edgomez 851 BitstreamSkip(bs, 3); // video_format
494 :     BitstreamSkip(bs, 1); // video_range
495 :     if (BitstreamGetBit(bs)) // color_description
496 : Isibaar 3 {
497 : suxen_drol 252 DPRINTF(DPRINTF_HEADER,"+ color_description");
498 : edgomez 851 BitstreamSkip(bs, 8); // color_primaries
499 :     BitstreamSkip(bs, 8); // transfer_characteristics
500 :     BitstreamSkip(bs, 8); // matrix_coefficients
501 : Isibaar 3 }
502 :     }
503 : suxen_drol 252 } else if ((start_code & ~VIDOBJ_START_CODE_MASK) == VIDOBJ_START_CODE) {
504 :    
505 :     DPRINTF(DPRINTF_STARTCODE, "<video_object>");
506 :     DPRINTF(DPRINTF_HEADER, "vo id %i", start_code & VIDOBJ_START_CODE_MASK);
507 :    
508 : edgomez 851 BitstreamSkip(bs, 32); // video_object_start_code
509 : suxen_drol 252
510 :     } else if ((start_code & ~VIDOBJLAY_START_CODE_MASK) == VIDOBJLAY_START_CODE) {
511 :    
512 :     DPRINTF(DPRINTF_STARTCODE, "<video_object_layer>");
513 :     DPRINTF(DPRINTF_HEADER, "vol id %i", start_code & VIDOBJLAY_START_CODE_MASK);
514 :    
515 : edgomez 851 BitstreamSkip(bs, 32); // video_object_layer_start_code
516 : Isibaar 3
517 : edgomez 851 BitstreamSkip(bs, 1); // random_accessible_vol
518 : Isibaar 3
519 : edgomez 851 // video_object_type_indication
520 :     if (BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_SIMPLE &&
521 :     BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_CORE &&
522 :     BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_MAIN &&
523 :     BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_ACE &&
524 : suxen_drol 946 BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_ART_SIMPLE &&
525 :     BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_ASP &&
526 : edgomez 851 BitstreamShowBits(bs, 8) != 0) // BUGGY DIVX
527 : Isibaar 3 {
528 : suxen_drol 252 DPRINTF(DPRINTF_ERROR,"video_object_type_indication %i not supported ",
529 :     BitstreamShowBits(bs, 8));
530 : Isibaar 3 return -1;
531 :     }
532 :     BitstreamSkip(bs, 8);
533 :    
534 :    
535 : edgomez 851 if (BitstreamGetBit(bs)) // is_object_layer_identifier
536 : Isibaar 3 {
537 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "+ is_object_layer_identifier");
538 : edgomez 851 vol_ver_id = BitstreamGetBits(bs, 4); // video_object_layer_verid
539 : suxen_drol 252 DPRINTF(DPRINTF_HEADER,"ver_id %i", vol_ver_id);
540 : edgomez 851 BitstreamSkip(bs, 3); // video_object_layer_priority
541 : edgomez 195 } else {
542 : Isibaar 3 vol_ver_id = 1;
543 :     }
544 :    
545 : edgomez 851 dec->aspect_ratio = BitstreamGetBits(bs, 4);
546 :    
547 :     if (dec->aspect_ratio == VIDOBJLAY_AR_EXTPAR) // aspect_ratio_info
548 : Isibaar 3 {
549 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "+ aspect_ratio_info");
550 : edgomez 851 dec->par_width = BitstreamGetBits(bs, 8); // par_width
551 :     dec->par_height = BitstreamGetBits(bs, 8); // par_height
552 : Isibaar 3 }
553 :    
554 : edgomez 851 if (BitstreamGetBit(bs)) // vol_control_parameters
555 : Isibaar 3 {
556 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "+ vol_control_parameters");
557 : edgomez 851 BitstreamSkip(bs, 2); // chroma_format
558 :     dec->low_delay = BitstreamGetBit(bs); // low_delay
559 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "low_delay %i", dec->low_delay);
560 : edgomez 851 if (BitstreamGetBit(bs)) // vbv_parameters
561 : Isibaar 3 {
562 : edgomez 851 unsigned int bitrate;
563 :     unsigned int buffer_size;
564 :     unsigned int occupancy;
565 :    
566 : suxen_drol 252 DPRINTF(DPRINTF_HEADER,"+ vbv_parameters");
567 : edgomez 851
568 :     bitrate = BitstreamGetBits(bs,15) << 15; // first_half_bit_rate
569 : Isibaar 3 READ_MARKER();
570 : edgomez 851 bitrate |= BitstreamGetBits(bs,15); // latter_half_bit_rate
571 : Isibaar 3 READ_MARKER();
572 : edgomez 851
573 :     buffer_size = BitstreamGetBits(bs, 15) << 3; // first_half_vbv_buffer_size
574 : Isibaar 3 READ_MARKER();
575 : edgomez 851 buffer_size |= BitstreamGetBits(bs, 3); // latter_half_vbv_buffer_size
576 :    
577 :     occupancy = BitstreamGetBits(bs, 11) << 15; // first_half_vbv_occupancy
578 : Isibaar 3 READ_MARKER();
579 : edgomez 851 occupancy |= BitstreamGetBits(bs, 15); // latter_half_vbv_occupancy
580 : Isibaar 3 READ_MARKER();
581 : edgomez 195
582 : edgomez 851 DPRINTF(DPRINTF_HEADER,"bitrate %d (unit=400 bps)", bitrate);
583 :     DPRINTF(DPRINTF_HEADER,"buffer_size %d (unit=16384 bits)", buffer_size);
584 :     DPRINTF(DPRINTF_HEADER,"occupancy %d (unit=64 bits)", occupancy);
585 : Isibaar 3 }
586 : edgomez 851 }else{
587 :     dec->low_delay = dec->low_delay_default;
588 : Isibaar 3 }
589 :    
590 : edgomez 851 dec->shape = BitstreamGetBits(bs, 2); // video_object_layer_shape
591 :    
592 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "shape %i", dec->shape);
593 : edgomez 851 if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR)
594 :     {
595 :     DPRINTF(DPRINTF_ERROR,"non-rectangular shapes are not supported");
596 :     }
597 : edgomez 195
598 :     if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE && vol_ver_id != 1) {
599 : edgomez 851 BitstreamSkip(bs, 4); // video_object_layer_shape_extension
600 : Isibaar 3 }
601 :    
602 :     READ_MARKER();
603 :    
604 : edgomez 851 // *************************** for decode B-frame time ***********************
605 :     dec->time_inc_resolution = BitstreamGetBits(bs, 16); // vop_time_increment_resolution
606 :     DPRINTF(DPRINTF_HEADER,"vop_time_increment_resolution %i", dec->time_inc_resolution);
607 : suxen_drol 252
608 : edgomez 851 // dec->time_inc_resolution--;
609 : suxen_drol 252
610 : edgomez 851 if (dec->time_inc_resolution > 0) {
611 :     dec->time_inc_bits = log2bin(dec->time_inc_resolution-1);
612 : edgomez 195 } else {
613 : edgomez 851 // dec->time_inc_bits = 0;
614 :     // for "old" xvid compatibility, set time_inc_bits = 1
615 : Isibaar 3 dec->time_inc_bits = 1;
616 :     }
617 :    
618 :     READ_MARKER();
619 :    
620 : edgomez 851 if (BitstreamGetBit(bs)) // fixed_vop_rate
621 : Isibaar 3 {
622 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "+ fixed_vop_rate");
623 : edgomez 851 BitstreamSkip(bs, dec->time_inc_bits); // fixed_vop_time_increment
624 : Isibaar 3 }
625 :    
626 : edgomez 195 if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {
627 : Isibaar 3
628 : edgomez 195 if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR) {
629 : Isibaar 3 uint32_t width, height;
630 :    
631 :     READ_MARKER();
632 : edgomez 851 width = BitstreamGetBits(bs, 13); // video_object_layer_width
633 : Isibaar 3 READ_MARKER();
634 : edgomez 851 height = BitstreamGetBits(bs, 13); // video_object_layer_height
635 : Isibaar 3 READ_MARKER();
636 :    
637 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "width %i", width);
638 :     DPRINTF(DPRINTF_HEADER, "height %i", height);
639 :    
640 : edgomez 851 if (dec->width != width || dec->height != height)
641 :     {
642 :     if (dec->fixed_dimensions)
643 :     {
644 : suxen_drol 890 DPRINTF(DPRINTF_ERROR, "decoder width/height does not match bitstream");
645 : edgomez 851 return -1;
646 :     }
647 :     resize = 1;
648 : chenm001 294 dec->width = width;
649 :     dec->height = height;
650 : Isibaar 3 }
651 :     }
652 : h 69
653 : suxen_drol 252 dec->interlacing = BitstreamGetBit(bs);
654 : edgomez 851 DPRINTF(DPRINTF_HEADER, "interlacing %i", dec->interlacing);
655 : Isibaar 3
656 : edgomez 851 if (!BitstreamGetBit(bs)) // obmc_disable
657 : Isibaar 3 {
658 : suxen_drol 252 DPRINTF(DPRINTF_ERROR, "obmc_disabled==false not supported");
659 : edgomez 851 // TODO
660 :     // fucking divx4.02 has this enabled
661 : Isibaar 3 }
662 :    
663 : edgomez 851 dec->sprite_enable = BitstreamGetBits(bs, (vol_ver_id == 1 ? 1 : 2)); // sprite_enable
664 :    
665 :     if (dec->sprite_enable == SPRITE_STATIC || dec->sprite_enable == SPRITE_GMC)
666 : Isibaar 3 {
667 : edgomez 851 int low_latency_sprite_enable;
668 :    
669 :     if (dec->sprite_enable != SPRITE_GMC)
670 :     {
671 :     int sprite_width;
672 :     int sprite_height;
673 :     int sprite_left_coord;
674 :     int sprite_top_coord;
675 :     sprite_width = BitstreamGetBits(bs, 13); // sprite_width
676 :     READ_MARKER();
677 :     sprite_height = BitstreamGetBits(bs, 13); // sprite_height
678 :     READ_MARKER();
679 :     sprite_left_coord = BitstreamGetBits(bs, 13); // sprite_left_coordinate
680 :     READ_MARKER();
681 :     sprite_top_coord = BitstreamGetBits(bs, 13); // sprite_top_coordinate
682 :     READ_MARKER();
683 :     }
684 :     dec->sprite_warping_points = BitstreamGetBits(bs, 6); // no_of_sprite_warping_points
685 :     dec->sprite_warping_accuracy = BitstreamGetBits(bs, 2); // sprite_warping_accuracy
686 :     dec->sprite_brightness_change = BitstreamGetBits(bs, 1); // brightness_change
687 :     if (dec->sprite_enable != SPRITE_GMC)
688 :     {
689 :     low_latency_sprite_enable = BitstreamGetBits(bs, 1); // low_latency_sprite_enable
690 :     }
691 : Isibaar 3 }
692 : edgomez 195
693 :     if (vol_ver_id != 1 &&
694 :     dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
695 : edgomez 851 BitstreamSkip(bs, 1); // sadct_disable
696 : Isibaar 3 }
697 :    
698 : edgomez 851 if (BitstreamGetBit(bs)) // not_8_bit
699 : Isibaar 3 {
700 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "not_8_bit==true (ignored)");
701 : edgomez 851 dec->quant_bits = BitstreamGetBits(bs, 4); // quant_precision
702 :     BitstreamSkip(bs, 4); // bits_per_pixel
703 : edgomez 195 } else {
704 : Isibaar 3 dec->quant_bits = 5;
705 :     }
706 :    
707 : edgomez 195 if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
708 : edgomez 851 BitstreamSkip(bs, 1); // no_gray_quant_update
709 :     BitstreamSkip(bs, 1); // composition_method
710 :     BitstreamSkip(bs, 1); // linear_composition
711 : Isibaar 3 }
712 :    
713 : edgomez 851 dec->quant_type = BitstreamGetBit(bs); // quant_type
714 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "quant_type %i", dec->quant_type);
715 : Isibaar 3
716 : edgomez 195 if (dec->quant_type) {
717 : edgomez 851 if (BitstreamGetBit(bs)) // load_intra_quant_mat
718 : Isibaar 3 {
719 : Isibaar 20 uint8_t matrix[64];
720 : edgomez 195
721 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "load_intra_quant_mat");
722 :    
723 : Isibaar 4 bs_get_matrix(bs, matrix);
724 :     set_intra_matrix(matrix);
725 : edgomez 195 } else
726 : Isibaar 20 set_intra_matrix(get_default_intra_matrix());
727 : Isibaar 4
728 : edgomez 851 if (BitstreamGetBit(bs)) // load_inter_quant_mat
729 : Isibaar 3 {
730 : edgomez 195 uint8_t matrix[64];
731 : suxen_drol 252
732 :     DPRINTF(DPRINTF_HEADER, "load_inter_quant_mat");
733 : edgomez 195
734 : Isibaar 4 bs_get_matrix(bs, matrix);
735 :     set_inter_matrix(matrix);
736 : edgomez 195 } else
737 : Isibaar 20 set_inter_matrix(get_default_inter_matrix());
738 : Isibaar 3
739 : edgomez 195 if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
740 : suxen_drol 252 DPRINTF(DPRINTF_ERROR, "greyscale matrix not supported");
741 : Isibaar 3 return -1;
742 :     }
743 : Isibaar 4
744 : Isibaar 3 }
745 :    
746 : edgomez 195
747 :     if (vol_ver_id != 1) {
748 : edgomez 851 dec->quarterpel = BitstreamGetBit(bs); // quarter_sample
749 :     DPRINTF(DPRINTF_HEADER,"quarterpel %i", dec->quarterpel);
750 : Isibaar 3 }
751 : Isibaar 333 else
752 :     dec->quarterpel = 0;
753 :    
754 : Isibaar 3
755 : edgomez 851 dec->complexity_estimation_disable = BitstreamGetBit(bs); /* complexity estimation disable */
756 :     if (!dec->complexity_estimation_disable)
757 : Isibaar 3 {
758 : edgomez 851 read_vol_complexity_estimation_header(bs, dec);
759 : Isibaar 3 }
760 :    
761 : edgomez 851 BitstreamSkip(bs, 1); // resync_marker_disable
762 : Isibaar 3
763 : edgomez 851 if (BitstreamGetBit(bs)) // data_partitioned
764 : Isibaar 3 {
765 : suxen_drol 252 DPRINTF(DPRINTF_ERROR, "data_partitioned not supported");
766 : edgomez 851 BitstreamSkip(bs, 1); // reversible_vlc
767 : Isibaar 3 }
768 :    
769 : edgomez 195 if (vol_ver_id != 1) {
770 : edgomez 851 dec->newpred_enable = BitstreamGetBit(bs);
771 :     if (dec->newpred_enable) // newpred_enable
772 : Isibaar 3 {
773 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "+ newpred_enable");
774 : edgomez 851 BitstreamSkip(bs, 2); // requested_upstream_message_type
775 :     BitstreamSkip(bs, 1); // newpred_segment_type
776 : Isibaar 3 }
777 : edgomez 851 dec->reduced_resolution_enable = BitstreamGetBit(bs); /* reduced_resolution_vop_enable */
778 :     DPRINTF(DPRINTF_HEADER, "reduced_resolution_enable %i", dec->reduced_resolution_enable);
779 : Isibaar 3 }
780 : edgomez 851 else
781 :     {
782 :     dec->newpred_enable = 0;
783 :     dec->reduced_resolution_enable = 0;
784 :     }
785 : edgomez 195
786 : edgomez 851 dec->scalability = BitstreamGetBit(bs); /* scalability */
787 :     if (dec->scalability)
788 : Isibaar 3 {
789 : suxen_drol 252 DPRINTF(DPRINTF_ERROR, "scalability not supported");
790 : edgomez 851 BitstreamSkip(bs, 1); /* hierarchy_type */
791 :     BitstreamSkip(bs, 4); /* ref_layer_id */
792 :     BitstreamSkip(bs, 1); /* ref_layer_sampling_direc */
793 :     BitstreamSkip(bs, 5); /* hor_sampling_factor_n */
794 :     BitstreamSkip(bs, 5); /* hor_sampling_factor_m */
795 :     BitstreamSkip(bs, 5); /* vert_sampling_factor_n */
796 :     BitstreamSkip(bs, 5); /* vert_sampling_factor_m */
797 :     BitstreamSkip(bs, 1); /* enhancement_type */
798 :     if(dec->shape == VIDOBJLAY_SHAPE_BINARY /* && hierarchy_type==0 */) {
799 :     BitstreamSkip(bs, 1); /* use_ref_shape */
800 :     BitstreamSkip(bs, 1); /* use_ref_texture */
801 :     BitstreamSkip(bs, 5); /* shape_hor_sampling_factor_n */
802 :     BitstreamSkip(bs, 5); /* shape_hor_sampling_factor_m */
803 :     BitstreamSkip(bs, 5); /* shape_vert_sampling_factor_n */
804 :     BitstreamSkip(bs, 5); /* shape_vert_sampling_factor_m */
805 :     }
806 : Isibaar 3 return -1;
807 :     }
808 : edgomez 851 } else // dec->shape == BINARY_ONLY
809 : Isibaar 3 {
810 : edgomez 195 if (vol_ver_id != 1) {
811 : edgomez 851 dec->scalability = BitstreamGetBit(bs); /* scalability */
812 :     if (dec->scalability)
813 : Isibaar 3 {
814 : edgomez 851 DPRINTF(DPRINTF_ERROR, "scalability not supported");
815 :     BitstreamSkip(bs, 4); /* ref_layer_id */
816 :     BitstreamSkip(bs, 5); /* hor_sampling_factor_n */
817 :     BitstreamSkip(bs, 5); /* hor_sampling_factor_m */
818 :     BitstreamSkip(bs, 5); /* vert_sampling_factor_n */
819 :     BitstreamSkip(bs, 5); /* vert_sampling_factor_m */
820 : Isibaar 3 return -1;
821 :     }
822 :     }
823 : edgomez 851 BitstreamSkip(bs, 1); // resync_marker_disable
824 : Isibaar 3
825 :     }
826 :    
827 : edgomez 851 return (resize ? -3 : -2 ); /* VOL */
828 :    
829 : edgomez 195 } else if (start_code == GRPOFVOP_START_CODE) {
830 : suxen_drol 252
831 :     DPRINTF(DPRINTF_STARTCODE, "<group_of_vop>");
832 :    
833 : Isibaar 3 BitstreamSkip(bs, 32);
834 :     {
835 :     int hours, minutes, seconds;
836 : edgomez 195
837 : Isibaar 3 hours = BitstreamGetBits(bs, 5);
838 :     minutes = BitstreamGetBits(bs, 6);
839 :     READ_MARKER();
840 :     seconds = BitstreamGetBits(bs, 6);
841 : suxen_drol 252
842 : edgomez 851 DPRINTF(DPRINTF_HEADER, "time %ih%im%is", hours,minutes,seconds);
843 : Isibaar 3 }
844 : edgomez 851 BitstreamSkip(bs, 1); // closed_gov
845 :     BitstreamSkip(bs, 1); // broken_link
846 : suxen_drol 252
847 : edgomez 195 } else if (start_code == VOP_START_CODE) {
848 : suxen_drol 252
849 :     DPRINTF(DPRINTF_STARTCODE, "<vop>");
850 :    
851 : edgomez 851 BitstreamSkip(bs, 32); // vop_start_code
852 : Isibaar 3
853 : edgomez 851 coding_type = BitstreamGetBits(bs, 2); // vop_coding_type
854 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "coding_type %i", coding_type);
855 : Isibaar 3
856 : edgomez 851 // *************************** for decode B-frame time ***********************
857 :     while (BitstreamGetBit(bs) != 0) // time_base
858 : chenm001 156 time_incr++;
859 : edgomez 195
860 : Isibaar 3 READ_MARKER();
861 : edgomez 195
862 :     if (dec->time_inc_bits) {
863 : edgomez 851 time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); // vop_time_increment
864 : Isibaar 3 }
865 : suxen_drol 240
866 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "time_base %i", time_incr);
867 :     DPRINTF(DPRINTF_HEADER, "time_increment %i", time_increment);
868 :    
869 :     DPRINTF(DPRINTF_TIMECODE, "%c %i:%i",
870 : edgomez 851 coding_type == I_VOP ? 'I' : coding_type == P_VOP ? 'P' : coding_type == B_VOP ? 'B' : 'S',
871 : suxen_drol 240 time_incr, time_increment);
872 :    
873 : edgomez 195 if (coding_type != B_VOP) {
874 :     dec->last_time_base = dec->time_base;
875 : chenm001 156 dec->time_base += time_incr;
876 : chl 316 dec->time = time_increment;
877 :    
878 : edgomez 851 /* dec->time_base * dec->time_inc_resolution +
879 : edgomez 195 time_increment;
880 : chl 316 */ dec->time_pp = (uint32_t)
881 : edgomez 851 (dec->time_inc_resolution + dec->time - dec->last_non_b_time)%dec->time_inc_resolution;
882 : edgomez 195 dec->last_non_b_time = dec->time;
883 :     } else {
884 : chl 316 dec->time = time_increment;
885 :     /*
886 : edgomez 195 (dec->last_time_base +
887 : edgomez 851 time_incr) * dec->time_inc_resolution + time_increment;
888 : chl 316 */
889 : chl 313 dec->time_bp = (uint32_t)
890 : edgomez 851 (dec->time_inc_resolution + dec->last_non_b_time - dec->time)%dec->time_inc_resolution;
891 : chenm001 156 }
892 : edgomez 851 DPRINTF(DPRINTF_HEADER,"time_pp=%i", dec->time_pp);
893 :     DPRINTF(DPRINTF_HEADER,"time_bp=%i", dec->time_bp);
894 : Isibaar 3
895 :     READ_MARKER();
896 :    
897 : edgomez 851 if (!BitstreamGetBit(bs)) // vop_coded
898 : Isibaar 3 {
899 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "vop_coded==false");
900 : Isibaar 3 return N_VOP;
901 :     }
902 :    
903 : edgomez 851 if (dec->newpred_enable)
904 :     {
905 :     int vop_id;
906 :     int vop_id_for_prediction;
907 :    
908 :     vop_id = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
909 :     DPRINTF(DPRINTF_HEADER, "vop_id %i", vop_id);
910 :     if (BitstreamGetBit(bs)) /* vop_id_for_prediction_indication */
911 :     {
912 :     vop_id_for_prediction = BitstreamGetBits(bs, MIN(dec->time_inc_bits + 3, 15));
913 :     DPRINTF(DPRINTF_HEADER, "vop_id_for_prediction %i", vop_id_for_prediction);
914 :     }
915 :     READ_MARKER();
916 :     }
917 : Isibaar 3
918 : edgomez 851
919 :    
920 :     // fix a little bug by MinChen <chenm002@163.com>
921 : edgomez 195 if ((dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) &&
922 : edgomez 851 ( (coding_type == P_VOP) || (coding_type == S_VOP && dec->sprite_enable == SPRITE_GMC) ) ) {
923 :     *rounding = BitstreamGetBit(bs); // rounding_type
924 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "rounding %i", *rounding);
925 : Isibaar 3 }
926 :    
927 : edgomez 851 if (dec->reduced_resolution_enable &&
928 :     dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR &&
929 :     (coding_type == P_VOP || coding_type == I_VOP)) {
930 : Isibaar 3
931 : edgomez 851 *reduced_resolution = BitstreamGetBit(bs);
932 :     DPRINTF(DPRINTF_HEADER, "reduced_resolution %i", *reduced_resolution);
933 :     }
934 :     else
935 :     {
936 :     *reduced_resolution = 0;
937 :     }
938 :    
939 : edgomez 195 if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
940 : edgomez 851 if(!(dec->sprite_enable == SPRITE_STATIC && coding_type == I_VOP)) {
941 : edgomez 195
942 : edgomez 851 uint32_t width, height;
943 :     uint32_t horiz_mc_ref, vert_mc_ref;
944 : Isibaar 3
945 : edgomez 851 width = BitstreamGetBits(bs, 13);
946 :     READ_MARKER();
947 :     height = BitstreamGetBits(bs, 13);
948 :     READ_MARKER();
949 :     horiz_mc_ref = BitstreamGetBits(bs, 13);
950 :     READ_MARKER();
951 :     vert_mc_ref = BitstreamGetBits(bs, 13);
952 :     READ_MARKER();
953 : Isibaar 3
954 : edgomez 851 DPRINTF(DPRINTF_HEADER, "width %i", width);
955 :     DPRINTF(DPRINTF_HEADER, "height %i", height);
956 :     DPRINTF(DPRINTF_HEADER, "horiz_mc_ref %i", horiz_mc_ref);
957 :     DPRINTF(DPRINTF_HEADER, "vert_mc_ref %i", vert_mc_ref);
958 :     }
959 :    
960 :     BitstreamSkip(bs, 1); // change_conv_ratio_disable
961 :     if (BitstreamGetBit(bs)) // vop_constant_alpha
962 : Isibaar 3 {
963 : edgomez 851 BitstreamSkip(bs, 8); // vop_constant_alpha_value
964 : Isibaar 3 }
965 :     }
966 :    
967 : edgomez 851 if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {
968 : edgomez 195
969 : edgomez 851 if (!dec->complexity_estimation_disable)
970 :     {
971 :     read_vop_complexity_estimation_header(bs, dec, coding_type);
972 :     }
973 :    
974 :     // intra_dc_vlc_threshold
975 : edgomez 195 *intra_dc_threshold =
976 :     intra_dc_threshold_table[BitstreamGetBits(bs, 3)];
977 : Isibaar 3
978 : edgomez 851 dec->top_field_first = 0;
979 :     dec->alternate_vertical_scan = 0;
980 :    
981 : edgomez 195 if (dec->interlacing) {
982 : suxen_drol 252 dec->top_field_first = BitstreamGetBit(bs);
983 :     DPRINTF(DPRINTF_HEADER, "interlace top_field_first %i", dec->top_field_first);
984 :     dec->alternate_vertical_scan = BitstreamGetBit(bs);
985 :     DPRINTF(DPRINTF_HEADER, "interlace alternate_vertical_scan %i", dec->alternate_vertical_scan);
986 :    
987 : h 69 }
988 : Isibaar 3 }
989 : edgomez 195
990 : edgomez 851 if ((dec->sprite_enable == SPRITE_STATIC || dec->sprite_enable== SPRITE_GMC) && coding_type == S_VOP) {
991 :    
992 :     int i;
993 :    
994 :     for (i = 0 ; i < dec->sprite_warping_points; i++)
995 :     {
996 :     int length;
997 :     int x = 0, y = 0;
998 :    
999 :     /* sprite code borowed from ffmpeg; thx Michael Niedermayer <michaelni@gmx.at> */
1000 :     length = bs_get_spritetrajectory(bs);
1001 :     if(length){
1002 :     x= BitstreamGetBits(bs, length);
1003 :     if ((x >> (length - 1)) == 0) /* if MSB not set it is negative*/
1004 :     x = - (x ^ ((1 << length) - 1));
1005 :     }
1006 :     READ_MARKER();
1007 :    
1008 :     length = bs_get_spritetrajectory(bs);
1009 :     if(length){
1010 :     y = BitstreamGetBits(bs, length);
1011 :     if ((y >> (length - 1)) == 0) /* if MSB not set it is negative*/
1012 :     y = - (y ^ ((1 << length) - 1));
1013 :     }
1014 :     READ_MARKER();
1015 :    
1016 :     gmc_warp->duv[i].x = x;
1017 :     gmc_warp->duv[i].y = y;
1018 :    
1019 :     DPRINTF(DPRINTF_HEADER,"sprite_warping_point[%i] xy=(%i,%i)", i, x, y);
1020 :     }
1021 :    
1022 :     if (dec->sprite_brightness_change)
1023 :     {
1024 :     // XXX: brightness_change_factor()
1025 :     }
1026 :     if (dec->sprite_enable == SPRITE_STATIC)
1027 :     {
1028 :     // XXX: todo
1029 :     }
1030 :    
1031 :     }
1032 :    
1033 :     if ((*quant = BitstreamGetBits(bs, dec->quant_bits)) < 1) // vop_quant
1034 : Isibaar 157 *quant = 1;
1035 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "quant %i", *quant);
1036 : edgomez 195
1037 :     if (coding_type != I_VOP) {
1038 : edgomez 851 *fcode_forward = BitstreamGetBits(bs, 3); // fcode_forward
1039 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "fcode_forward %i", *fcode_forward);
1040 : Isibaar 3 }
1041 : edgomez 195
1042 :     if (coding_type == B_VOP) {
1043 : edgomez 851 *fcode_backward = BitstreamGetBits(bs, 3); // fcode_backward
1044 : suxen_drol 252 DPRINTF(DPRINTF_HEADER, "fcode_backward %i", *fcode_backward);
1045 : Isibaar 3 }
1046 : edgomez 195 if (!dec->scalability) {
1047 :     if ((dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) &&
1048 :     (coding_type != I_VOP)) {
1049 : edgomez 851 BitstreamSkip(bs, 1); // vop_shape_coding_type
1050 : chenm001 156 }
1051 :     }
1052 : Isibaar 3 return coding_type;
1053 : suxen_drol 252
1054 : edgomez 195 } else if (start_code == USERDATA_START_CODE) {
1055 : edgomez 851 char tmp[256];
1056 :     int i, version, build;
1057 :     char packed;
1058 : suxen_drol 252
1059 : edgomez 851 BitstreamSkip(bs, 32); // user_data_start_code
1060 : suxen_drol 252
1061 : edgomez 851 tmp[0] = BitstreamShowBits(bs, 8);
1062 :    
1063 :     for(i = 1; i < 256; i++){
1064 :     tmp[i] = (BitstreamShowBits(bs, 16) & 0xFF);
1065 :    
1066 :     if(tmp[i] == 0)
1067 :     break;
1068 :    
1069 :     BitstreamSkip(bs, 8);
1070 :     }
1071 : suxen_drol 252
1072 : suxen_drol 920 DPRINTF(DPRINTF_STARTCODE, "<user_data>: %s", tmp);
1073 : edgomez 851
1074 :     /* divx detection */
1075 :     i = sscanf(tmp, "DivX%dBuild%d%c", &version, &build, &packed);
1076 :     if (i < 2)
1077 :     i = sscanf(tmp, "DivX%db%d%c", &version, &build, &packed);
1078 :    
1079 :     if (i >= 2)
1080 :     {
1081 :     dec->packed_mode = (i == 3 && packed == 'p');
1082 :     DPRINTF(DPRINTF_HEADER, "divx version=%i, build=%i packed=%i",
1083 :     version, build, dec->packed_mode);
1084 :     }
1085 :    
1086 :     } else // start_code == ?
1087 : Isibaar 3 {
1088 : edgomez 195 if (BitstreamShowBits(bs, 24) == 0x000001) {
1089 : suxen_drol 252 DPRINTF(DPRINTF_STARTCODE, "<unknown: %x>", BitstreamShowBits(bs, 32));
1090 : Isibaar 3 }
1091 :     BitstreamSkip(bs, 8);
1092 :     }
1093 :     }
1094 :     while ((BitstreamPos(bs) >> 3) < bs->length);
1095 :    
1096 : edgomez 851 //DPRINTF("*** WARNING: no vop_start_code found");
1097 : edgomez 195 return -1; /* ignore it */
1098 : Isibaar 3 }
1099 :    
1100 :    
1101 :     /* write custom quant matrix */
1102 :    
1103 : edgomez 195 static void
1104 :     bs_put_matrix(Bitstream * bs,
1105 :     const int16_t * matrix)
1106 : Isibaar 3 {
1107 :     int i, j;
1108 :     const int last = matrix[scan_tables[0][63]];
1109 :    
1110 : suxen_drol 233 for (j = 63; j > 0 && matrix[scan_tables[0][j - 1]] == last; j--);
1111 : Isibaar 3
1112 : edgomez 195 for (i = 0; i <= j; i++) {
1113 : Isibaar 3 BitstreamPutBits(bs, matrix[scan_tables[0][i]], 8);
1114 :     }
1115 :    
1116 : edgomez 195 if (j < 63) {
1117 : Isibaar 3 BitstreamPutBits(bs, 0, 8);
1118 :     }
1119 :     }
1120 :    
1121 :    
1122 :     /*
1123 :     write vol header
1124 :     */
1125 : edgomez 195 void
1126 :     BitstreamWriteVolHeader(Bitstream * const bs,
1127 : suxen_drol 890 const MBParam * pParam)
1128 : Isibaar 3 {
1129 : edgomez 851 static const unsigned int vo_id = 0;
1130 :     static const unsigned int vol_id = 0;
1131 :     int vol_ver_id=1;
1132 :     int profile = 0x03; /* simple profile/level 3 */
1133 : suxen_drol 947 int vol_type_ind=VIDOBJLAY_TYPE_SIMPLE;
1134 : edgomez 851
1135 : suxen_drol 890 if ( (pParam->vol_flags & XVID_QUARTERPEL) ||
1136 :     (pParam->vol_flags & XVID_GMC) ||
1137 :     (pParam->vol_flags & XVID_REDUCED_ENABLE))
1138 : edgomez 851 vol_ver_id = 2;
1139 :    
1140 : suxen_drol 947 if ((pParam->vol_flags & XVID_REDUCED_ENABLE)) {
1141 : edgomez 851 profile = 0x93; /* advanced realtime simple profile/level 3 */
1142 : suxen_drol 947 vol_type_ind = VIDOBJLAY_TYPE_ART_SIMPLE;
1143 :     }
1144 : edgomez 851
1145 : suxen_drol 890 if ((pParam->vol_flags & XVID_QUARTERPEL) ||
1146 : suxen_drol 947 (pParam->vol_flags & XVID_GMC)) {
1147 : edgomez 851 profile = 0xf3; /* advanced simple profile/level 2 */
1148 : suxen_drol 947 vol_type_ind = VIDOBJLAY_TYPE_ASP;
1149 :     }
1150 : edgomez 851
1151 :     // visual_object_sequence_start_code
1152 :     // BitstreamPad(bs);
1153 :     /* no padding here, anymore. You have to make sure that you are
1154 :     byte aligned, and that always 1-8 padding bits have been written */
1155 :    
1156 :     BitstreamPutBits(bs, VISOBJSEQ_START_CODE, 32);
1157 :     BitstreamPutBits(bs, profile, 8);
1158 :    
1159 :     // visual_object_start_code
1160 : edgomez 195 BitstreamPad(bs);
1161 : edgomez 851 BitstreamPutBits(bs, VISOBJ_START_CODE, 32);
1162 :     BitstreamPutBits(bs, 0, 1); // is_visual_object_identifier
1163 :     BitstreamPutBits(bs, VISOBJ_TYPE_VIDEO, 4); // visual_object_type
1164 :    
1165 :     // video object_start_code & vo_id
1166 :     BitstreamPad(bs);
1167 :     BitstreamPutBits(bs, VIDOBJ_START_CODE|(vo_id&0x5), 32);
1168 : Isibaar 3
1169 : edgomez 851 // video_object_layer_start_code & vol_id
1170 :     BitstreamPad(bs);
1171 :     BitstreamPutBits(bs, VIDOBJLAY_START_CODE|(vol_id&0x4), 32);
1172 : Isibaar 3
1173 : edgomez 851 BitstreamPutBit(bs, 0); // random_accessible_vol
1174 :     BitstreamPutBits(bs, 0, 8); // video_object_type_indication
1175 : suxen_drol 164
1176 : edgomez 851 if (vol_ver_id == 1)
1177 :     {
1178 :     BitstreamPutBit(bs, 0); // is_object_layer_identified (0=not given)
1179 :     }
1180 :     else
1181 :     {
1182 :     BitstreamPutBit(bs, 1); // is_object_layer_identified
1183 :     BitstreamPutBits(bs, vol_ver_id, 4); // vol_ver_id == 2
1184 :     BitstreamPutBits(bs, 4, 3); // vol_ver_priority (1==lowest, 7==highest) ??
1185 :     }
1186 : chl 387
1187 : edgomez 851 BitstreamPutBits(bs, 1, 4); // aspect_ratio_info (1=1:1)
1188 : edgomez 487
1189 : edgomez 851 BitstreamPutBit(bs, 1); // vol_control_parameters
1190 :     BitstreamPutBits(bs, 1, 2); // chroma_format 1="4:2:0"
1191 : suxen_drol 164
1192 : edgomez 851 if (pParam->max_bframes > 0) {
1193 :     BitstreamPutBit(bs, 0); // low_delay
1194 :     } else
1195 :     {
1196 :     BitstreamPutBit(bs, 1); // low_delay
1197 :     }
1198 :     BitstreamPutBit(bs, 0); // vbv_parameters (0=not given)
1199 : Isibaar 3
1200 : edgomez 851 BitstreamPutBits(bs, 0, 2); // video_object_layer_shape (0=rectangular)
1201 :    
1202 : Isibaar 3 WRITE_MARKER();
1203 : edgomez 195
1204 : edgomez 851 /* time_inc_resolution; ignored by current decore versions
1205 :     eg. 2fps res=2 inc=1
1206 :     25fps res=25 inc=1
1207 :     29.97fps res=30000 inc=1001
1208 : edgomez 195 */
1209 : suxen_drol 163 BitstreamPutBits(bs, pParam->fbase, 16);
1210 : Isibaar 3
1211 :     WRITE_MARKER();
1212 :    
1213 : suxen_drol 924 if (pParam->fincr>0) {
1214 :     BitstreamPutBit(bs, 1); // fixed_vop_rate = 1
1215 :     BitstreamPutBits(bs, pParam->fincr, log2bin(pParam->fbase)); // fixed_vop_time_increment
1216 :     }else{
1217 :     BitstreamPutBit(bs, 0); // fixed_vop_rate = 0
1218 :     }
1219 : Isibaar 3
1220 :     WRITE_MARKER();
1221 : edgomez 851 BitstreamPutBits(bs, pParam->width, 13); // width
1222 : Isibaar 3 WRITE_MARKER();
1223 : edgomez 851 BitstreamPutBits(bs, pParam->height, 13); // height
1224 : Isibaar 3 WRITE_MARKER();
1225 : edgomez 195
1226 : suxen_drol 890 BitstreamPutBit(bs, pParam->vol_flags & XVID_INTERLACING); // interlace
1227 : edgomez 851 BitstreamPutBit(bs, 1); // obmc_disable (overlapped block motion compensation)
1228 : Isibaar 3
1229 : edgomez 851 if (vol_ver_id != 1)
1230 : suxen_drol 890 { if ((pParam->vol_flags & XVID_GMC))
1231 : edgomez 851 { BitstreamPutBits(bs, 2, 2); // sprite_enable=='GMC'
1232 :     BitstreamPutBits(bs, 2, 6); // no_of_sprite_warping_points
1233 :     BitstreamPutBits(bs, 3, 2); // sprite_warping_accuracy 0==1/2, 1=1/4, 2=1/8, 3=1/16
1234 :     BitstreamPutBit(bs, 0); // sprite_brightness_change (not supported)
1235 :    
1236 :     /* currently we use no_of_sprite_warping_points==2, sprite_warping_accuracy==3
1237 :     for DivX5 compatability */
1238 :    
1239 :     } else
1240 :     BitstreamPutBits(bs, 0, 2); // sprite_enable==off
1241 :     }
1242 :     else
1243 :     BitstreamPutBit(bs, 0); // sprite_enable==off
1244 :    
1245 :     BitstreamPutBit(bs, 0); // not_8_bit
1246 :    
1247 :     // quant_type 0=h.263 1=mpeg4(quantizer tables)
1248 : suxen_drol 890 BitstreamPutBit(bs, pParam->vol_flags & XVID_MPEGQUANT);
1249 : edgomez 195
1250 : suxen_drol 890 if ((pParam->vol_flags & XVID_MPEGQUANT)) {
1251 : edgomez 851 BitstreamPutBit(bs, get_intra_matrix_status()); // load_intra_quant_mat
1252 : edgomez 195 if (get_intra_matrix_status()) {
1253 : Isibaar 4 bs_put_matrix(bs, get_intra_matrix());
1254 : Isibaar 3 }
1255 :    
1256 : edgomez 851 BitstreamPutBit(bs, get_inter_matrix_status()); // load_inter_quant_mat
1257 : edgomez 195 if (get_inter_matrix_status()) {
1258 : Isibaar 4 bs_put_matrix(bs, get_inter_matrix());
1259 : Isibaar 3 }
1260 :    
1261 :     }
1262 :    
1263 : edgomez 851 if (vol_ver_id != 1) {
1264 : suxen_drol 890 if ((pParam->vol_flags & XVID_QUARTERPEL))
1265 : edgomez 851 BitstreamPutBit(bs, 1); // quarterpel
1266 :     else
1267 :     BitstreamPutBit(bs, 0); // no quarterpel
1268 :     }
1269 :    
1270 :     BitstreamPutBit(bs, 1); // complexity_estimation_disable
1271 :     BitstreamPutBit(bs, 1); // resync_marker_disable
1272 :     BitstreamPutBit(bs, 0); // data_partitioned
1273 :    
1274 :     if (vol_ver_id != 1)
1275 :     {
1276 :     BitstreamPutBit(bs, 0); // newpred_enable
1277 :    
1278 : suxen_drol 890 BitstreamPutBit(bs, (pParam->vol_flags & XVID_REDUCED_ENABLE)?1:0);
1279 : edgomez 851 /* reduced_resolution_vop_enabled */
1280 :     }
1281 :    
1282 :     BitstreamPutBit(bs, 0); // scalability
1283 :    
1284 :     /* fake divx5 id, to ensure compatibility with divx5 decoder */
1285 : suxen_drol 890 #define DIVX5_ID "DivX000b000p"
1286 :     if (pParam->max_bframes > 0 && (pParam->global_flags & XVID_PACKED)) {
1287 : edgomez 851 BitstreamWriteUserData(bs, DIVX5_ID, strlen(DIVX5_ID));
1288 :     }
1289 :    
1290 :     /* xvid id */
1291 :     #define XVID_ID "XviD" XVID_BS_VERSION
1292 :     BitstreamWriteUserData(bs, XVID_ID, strlen(XVID_ID));
1293 : Isibaar 3 }
1294 :    
1295 :    
1296 :     /*
1297 :     write vop header
1298 :     */
1299 : edgomez 195 void
1300 : edgomez 851 BitstreamWriteVopHeader(
1301 :     Bitstream * const bs,
1302 : edgomez 195 const MBParam * pParam,
1303 : edgomez 851 const FRAMEINFO * const frame,
1304 : suxen_drol 229 int vop_coded)
1305 : Isibaar 3 {
1306 : suxen_drol 152 uint32_t i;
1307 : chl 387
1308 : edgomez 851 // BitstreamPad(bs);
1309 :     /* no padding here, anymore. You have to make sure that you are
1310 :     byte aligned, and that always 1-8 padding bits have been written */
1311 :    
1312 : edgomez 195 BitstreamPutBits(bs, VOP_START_CODE, 32);
1313 : Isibaar 3
1314 : edgomez 195 BitstreamPutBits(bs, frame->coding_type, 2);
1315 : edgomez 851 DPRINTF(DPRINTF_HEADER, "coding_type = %i", frame->coding_type);
1316 : edgomez 195
1317 :     for (i = 0; i < frame->seconds; i++) {
1318 : suxen_drol 152 BitstreamPutBit(bs, 1);
1319 :     }
1320 :     BitstreamPutBit(bs, 0);
1321 : Isibaar 3
1322 :     WRITE_MARKER();
1323 :    
1324 : edgomez 851 // time_increment: value=nth_of_sec, nbits = log2(resolution)
1325 :    
1326 : edgomez 195 BitstreamPutBits(bs, frame->ticks, log2bin(pParam->fbase));
1327 : edgomez 851 /*DPRINTF("[%i:%i] %c", frame->seconds, frame->ticks,
1328 :     frame->coding_type == I_VOP ? 'I' : frame->coding_type ==
1329 :     P_VOP ? 'P' : 'B');*/
1330 : Isibaar 3
1331 :     WRITE_MARKER();
1332 :    
1333 : suxen_drol 229 if (!vop_coded) {
1334 :     BitstreamPutBits(bs, 0, 1);
1335 :     return;
1336 :     }
1337 :    
1338 : edgomez 851 BitstreamPutBits(bs, 1, 1); // vop_coded
1339 : Isibaar 3
1340 : edgomez 851 if ( (frame->coding_type == P_VOP) || (frame->coding_type == S_VOP) )
1341 : suxen_drol 136 BitstreamPutBits(bs, frame->rounding_type, 1);
1342 : Isibaar 3
1343 : suxen_drol 890 if ((frame->vol_flags & XVID_REDUCED_ENABLE))
1344 :     BitstreamPutBit(bs, (frame->vop_flags & XVID_REDUCED)?1:0);
1345 : edgomez 195
1346 : edgomez 851 BitstreamPutBits(bs, 0, 3); // intra_dc_vlc_threshold
1347 :    
1348 : suxen_drol 890 if ((frame->vol_flags & XVID_INTERLACING)) {
1349 :     BitstreamPutBit(bs, (frame->vop_flags & XVID_TOPFIELDFIRST));
1350 :     BitstreamPutBit(bs, (frame->vop_flags & XVID_ALTERNATESCAN));
1351 : h 69 }
1352 : edgomez 851
1353 :     if (frame->coding_type == S_VOP) {
1354 :     if (1) { // no_of_sprite_warping_points>=1 (we use 2!)
1355 :     int k;
1356 :     for (k=0;k<2;k++)
1357 :     {
1358 :     bs_put_spritetrajectory(bs, frame->warp.duv[k].x ); // du[k]
1359 :     WRITE_MARKER();
1360 :    
1361 :     bs_put_spritetrajectory(bs, frame->warp.duv[k].y ); // dv[k]
1362 :     WRITE_MARKER();
1363 : h 69
1364 : suxen_drol 890 if ((frame->vol_flags & XVID_QUARTERPEL))
1365 : edgomez 851 {
1366 :     DPRINTF(DPRINTF_HEADER,"sprite_warping_point[%i] xy=(%i,%i) *QPEL*", k, frame->warp.duv[k].x/2, frame->warp.duv[k].y/2);
1367 :     }
1368 :     else
1369 :     {
1370 :     DPRINTF(DPRINTF_HEADER,"sprite_warping_point[%i] xy=(%i,%i)", k, frame->warp.duv[k].x, frame->warp.duv[k].y);
1371 :     }
1372 :     }
1373 :     }
1374 :     }
1375 :    
1376 : edgomez 195
1377 : edgomez 851 DPRINTF(DPRINTF_HEADER, "quant = %i", frame->quant);
1378 :    
1379 :     BitstreamPutBits(bs, frame->quant, 5); // quantizer
1380 :    
1381 : suxen_drol 136 if (frame->coding_type != I_VOP)
1382 : edgomez 851 BitstreamPutBits(bs, frame->fcode, 3); // forward_fixed_code
1383 : suxen_drol 152
1384 :     if (frame->coding_type == B_VOP)
1385 : edgomez 851 BitstreamPutBits(bs, frame->bcode, 3); // backward_fixed_code
1386 : suxen_drol 152
1387 : Isibaar 3 }
1388 : edgomez 851
1389 :     void
1390 :     BitstreamWriteUserData(Bitstream * const bs,
1391 :     uint8_t * data,
1392 :     const int length)
1393 :     {
1394 :     int i;
1395 :    
1396 :     BitstreamPad(bs);
1397 :     BitstreamPutBits(bs, USERDATA_START_CODE, 32);
1398 :    
1399 :     for (i = 0; i < length; i++) {
1400 :     BitstreamPutBits(bs, data[i], 8);
1401 :     }
1402 :    
1403 :     }

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